On Thu, Feb 12, 2009 at 12:22 PM, Meikel Brandmeyer <m...@kotka.de> wrote: > Hi, > > Am 12.02.2009 um 18:29 schrieb Mark Volkmann: > >> (def f-infinite-seq (map f (iterate inc 0))) ; values 0 through infinity >> >> (println "The first is" (first f-infinite-seq)) >> (println "The third is" (nth f-infinite-seq 2)) > > The result is cached in f-infinite-seq. So as long as you hold > onto the head of the seq, the value will be there, even if you > don't use the result of the "first" call. > > The solution is probably to not hold onto the head.
Thanks! I knew about the issue with holding onto the head, but for some reason didn't notice that I was doing that. I guess I thought that "holding the head" meant putting the first item from the lazy sequence into a variable, not putting the lazy sequence itself into a variable. > Either feed the infinite seq directly to the consumer, without storing > it in a global Var or a local. Or use a factory function which > returns a fresh seq, everytime you call it. > > (defn f-infinite-seq > [] > (map f (iterate inc 0))) > > (println "The first is" (first (f-infinite-seq))) > (println "The third is" (nth (f-infinite-seq) 2))) I like this approach. Thanks for explaining that! -- R. Mark Volkmann Object Computing, Inc. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
